Showing papers by "Agilent Technologies published in 1988"

Membrane probe with automatic contact scrub action

Abstract: An apparatus [10] for providing an automatic lateral scrubbing motion when a test membrane [22] engages a device under test (DUT) (not shown). Included are a fixed length flexure pivot assembly [30] and a pair of variable length flexure pivot assemblies [38]. Signal traces, signal trace terminals, and contact bumps [23, 25, 60] are formed for communicating electrical signals between the apparatus [10] and the DUT. A membrane [22] is stretched and configured for carrying the signal traces, signal trace terminals, and contact bumps [23, 25 and 60]. A hexagonal translation stage [28] is formed with an upper surface [29] disposed for being coupled to at lesat one of the fixed and variable length flexure pivot assemblies [30 and 38], and formed with a lower surface [54]. Surface [54] is formed to define an aperture [51] through itself, formed for securing over itself the membrane [22] when stretched; it is disposed for being coupled to membrane [22]. Finally included is a carrier [12], formed for suspending the hexagonal translation stage [28] and fixed and variable length flexure pivot assemblies [30 and 38].

Integrated circuit transfer test device system

Abstract: A system for testing semiconductor components (47) such as TTL components and CMOS components to determine whether the input (26), output (36) and ground pins (53) are conductively connected to a circuit, such as the circuit of a printed circuit board, and whether proper conductive paths exist between the connector pins and the ground pin (53) through the semiconductor. This is accomplished by providing a current pulse on one terminal to generate a voltage drop across an inherent resistance of the component (47) which is connected in series with the other terminal of the component and detecting the resulting voltage drop to show that the input and output terminals, as well as the ground terminal, are properly connected to the printed circuit board.

Light transmitting device utilizing indirect reflection

Abstract: An optical transmitter assembly comprises a laser (2) and an optical detector (4) arranged to receive light output from the laser (2) indirectly via a spherical lens (3). The source (2) and the detector (4) are mounted on a common support structure (1), and the lens (3) is mounted directly on the detector (4).

Method for generating extremely short ion pulses of high intensity from a pulsed ion source

Abstract: In a method for generating extremely short ion pulses having a high intensity and a pulsed ion source to generate extremely short ion pulses having a high intensity, the ions are generated by an electron, laser or particle beam and are stored in a potential well formed by at least three electrodes, at least one of the central electrodes having a more attractive potential for the ions in question than the other electrodes. A single electrical pulse is used for extracting the ions from the potential well. Correspondingly constructed pulsed ion sources are particularly suitable for use in time-of-flight mass spectrometry. The ion storage effect is produced by a number of electrodes which generate a potential well for the ions to be detected. The ion compression is determined by the field strength existing during the ion extraction in the ion source which should be approximately equal in the entire area of acceleration.

On-axis electron acceleration electrode for liquid chromatography/mass spectrometry

Abstract: An improved liquid chromatography/mass spectrometer apparatus is disclosed of the type wherein the liquid eluent from a chromatograph column is injected as a heated spray into an ionization chamber located between the chromatograph and the mass spectrometer to form ionized adducts containing solvent and the molecule to be analyzed which are then passed into the mass spectrometer through an exit port in the sidewall of the ionization chamber. The improvement comprises an acceleration electrode located in the sidewall of the ionization chamber at a position opposite the exit port into the mass spectrometer, an electron emission source located between the acceleration electrode and the point of injection of the heated spray into the chamber, and means for providing a positive voltage on the acceleration electrode with respect to the electron emission source in the ionization chamber. The acceleration electrode is maintained at a voltage sufficiently high to permit a stream of electrons flowing from the electron emission source to the acceleration electrode to bombard the heated spray to form hydronium ions, and fragment at least a portion of the molecules being analyzed into two or more lower molecular weight constituents or molecular ions to thereby aid in identification of the molecule.

Data processing systems for coordinating measurement activity upon a plurality of emulators

Abstract: A system for coordinating the measurement activity of a plurality of emulators and their associated internal analyzers uses a bus with three signal lines. A READY signal is set false by any emulator that initiates a break (a transition from running user code to running a monitor). The READY signal is set false by the breaking emulator at the very beginning of its break, without waiting for the resumption of the monitor program. The false ready signal is detected immediately by the other emulators, which then break in sympathy. The READY signal is further used to restart all emulators in unsion. The emulator that initiated the break remains running its monitor, while the others start their monitors, determine that they did not cause the break, and then in anticipation of a restart, essentially suspend their monitors and prepare to start running user code. As each emulator becomes ready it releases the READY signal. As the last emulator becomes ready, it too releases READY, which then goes true. At this all emulators complete their escape from their monitors (which for each of them amounts to just an instruction fetch, or so) and resume execution of their user code. A four-state state machine in each emulator assists in this, and is in part, advanced through its states by transitions in the READY signal. The four states correspond to: running the monitor, ready to start executing user code, executing user code, and invoking the monitor. A TRIGGER signal is available to allow analyzers to trigger other analyzers, or to cause an emulator to break. An EXECUTE signal is available to allow a single command issued to any emulator to cause target system starts from preselected initial conditions.